Correction :

6 × 2 = 12	7 + 23 = 30
2 + 7 = 9	8 : 4 = 2
22 - 9 = 13	22 + 8 = 30
21 + 10 = 31	30 - 7 = 23
23 + 10 = 33	11 × 1 = 11
7 + 8 = 15	7 × 4 = 28
33 - 16 = 17	60 : 6 = 10
20 + 17 = 37	24 : 6 = 4
15 + 11 = 26	30 - 19 = 11
16 + 11 = 27	4 + 7 = 11